Ssh without password
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Secure shell (ssh) protocols can be configure to work without protocols. This is particularly helpful for machines that are used often.
Configuring ssh without password from a POSIX-compliant terminal
Step 1: create a public key and copy to remote computer
- Log into a local Linux or MacOSX computer
- Type the following to generate the ssh key:
<source lang='bash'> ssh-keygen -t dsa </source>
- Accept the default key location by pressing
Enter
. - Secure permission of your authentication keys by closing permission to your home directory, .ssh directory, and authentication files
<source lang='bash'> chmod go-w $HOME chmod 700 $HOME/.ssh chmod go-rwx $HOME/.ssh/* </source>
- Type the following to copy the key to the remote server (this will prompt for a password).
<source lang='bash'> cd ~/.ssh scp id_dsa.pub remote_username@remote_host:/tmp </source>
- Type the following to add the ssh key to the remote user's authorization keys (this will prompt for a password).
ssh remote_username@remote_host 'cat /tmp/id_dsa.pub >>/home/
Step 2: configure the public key from the local computer on the remote computer
- log in to the remote computer using ssh (this will prompt for a password)
<source lang='bash'> ssh remote_username@remote_host </source>
- copy the public key generated on the local computer, that was copied to
/tmp
on the remote computer, is now appended to.ssh/authorized_keys
.
<source lang='bash'> cat /tmp/id_dsa.pub >>$HOME/.ssh/authorized_keys2 </source>
- similar to your local computer, make sure the permission on your remote home folder, .ssh folder, and authentication files are properly set (NOTE: this may already be the case).<source lang='bash'>
chmod go-w $HOME chmod 700 $HOME/.ssh chmod go-rwx $HOME/.ssh/* </source>